Association schemes with a certain type of p-subschemes
نویسندگان
چکیده
منابع مشابه
On Subschemes of Formal Schemes
We think about what the subscheme of the formal scheme is. Differently form the ordinary scheme, the formal scheme has different notions of “subscheme”. We lay a foundation for these notions and compare them. We also relate them to singularities of foliations.
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A Remark on Association Schemes with Two P-polynomial Structures
Gardiner [5] and Bannai and Bannai [1] classified symmetric association schemes (X, {Ro, ... , Rd}) such that for (at least) two different choices of i, the graph (X, Ri ) is distance-regular with diameter d. It turns out that except in the case of a polygon there are never more than two choices for i. Let one of the choices be i = 1, and let the ordering of the relations be such that R j is th...
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Embeddings of Projective Schemes Blown up at Subschemes
Suppose X is a nonsingular projective scheme, Z a nonsingular closed sub-scheme of X. Let˜X be the blowup of X centered at Z, E0 the pull-back of a general hyperplane in X, and E the exceptional divisor. In this paper, we study projective em-beddings of˜X given by divisors De,t = tE0 − eE. When X satisfies a necessary condition, we give explicit values of d and δ such that for all e > 0 and t >...
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ژورنال
عنوان ژورنال: Ars Mathematica Contemporanea
سال: 2020
ISSN: 1855-3974,1855-3966
DOI: 10.26493/1855-3974.2034.dad